Yamaha YZ450F 2021 - Suspension Setting (Rear Shock Absorber)

CHASSIS
10-7
EAM30180
SUSPENSION SETTING (REAR SHOCK ABSORBER)
TIP
• If any of the following symptoms is experienced with the standard position as the base, make resetting
by reference to the adjustment procedure given in the same chart.
• Adjust the rebound damping in 2-click increments or decrements.
• Adjust the low compression damping in 1-click increments or decrements.
• Adjust the high compression damping in 1/6 turn increments or decrements.
Low front, tend-
ing to lower front
posture

Compression
damping force
Turn adjuster clockwise (about 2
clicks) to increase damping.
Rebound damp-
ing force
Turn adjuster counterclockwise
(about 2 clicks) to decrease
damping.
Balance with rear
end
Set sunken length for 95–100
mm (3.7–3.9 in) when one pas-
senger is astride seat (lower rear
posture).
Oil amount
Increase oil amount by about 5
cm³ (0.2 US oz, 0.2 Imp.oz).
“Obtrusive” front,
tending to upper
front posture

Compression
damping force
Turn adjuster counterclockwise
(about 2 clicks) to decrease
damping.
Balance with rear
end
Set sunken length for 90–95 mm
(3.5–3.7 in) when one passenger
is astride seat (upper rear pos-
ture).
Spring Replace with soft spring.
Oil amount
Decrease oil amount by about 5–
10 cm³ (0.2–0.3 US oz, 0.2–0.4
Imp.oz).
Symptom
Section
Check Adjust
Jump
Large
gap
Medium
gap
Small
gap
Stiff, tending to
sink

Rebound damp-
ing force
Turn adjuster counterclockwise
(about 2 clicks) to decrease
damping.
Spring set length
Set sunken length for 90–100
mm (3.5–3.9 in) when one pas-
senger is astride seat.
Spongy and
unstable

Rebound damp-
ing force
Turn adjuster clockwise (about 2
clicks) to increase damping.
Low compres-
sion damping
Turn adjuster clockwise (about 1
click) to increase damping.
Spring Replace with stiff spring.
Symptom
Section
Check Adjust
Jump
Large
gap
Medium
gap
Small
gap